From f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 01:04:47 +0000
Subject: [PATCH] add driver 5G
---
kernel/include/linux/highmem.h | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/kernel/include/linux/highmem.h b/kernel/include/linux/highmem.h
index 220e92c..f5299b5 100644
--- a/kernel/include/linux/highmem.h
+++ b/kernel/include/linux/highmem.h
@@ -334,4 +334,22 @@
#endif
+static inline void memcpy_from_page(char *to, struct page *page,
+ size_t offset, size_t len)
+{
+ char *from = kmap_atomic(page);
+
+ memcpy(to, from + offset, len);
+ kunmap_atomic(from);
+}
+
+static inline void memcpy_to_page(struct page *page, size_t offset,
+ const char *from, size_t len)
+{
+ char *to = kmap_atomic(page);
+
+ memcpy(to + offset, from, len);
+ kunmap_atomic(to);
+}
+
#endif /* _LINUX_HIGHMEM_H */
--
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